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Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having nonzero determinant, with rows and columns of the latter in lexicographically nondecreasing order
1

%I #5 Aug 11 2014 22:45:52

%S 16,179,2080,23940,256067,2474769,21404483,166020522,1163861138,

%T 7445531291,43876608955,240208954149,1230708580912,5938337220753,

%U 27130252386880,117902658339547,489326493663683,1946146450518376

%N Number of nX5 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X6 binary array having nonzero determinant, with rows and columns of the latter in lexicographically nondecreasing order

%C Column 5 of A227558

%H R. H. Hardin, <a href="/A227557/b227557.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A227557/a227557.txt">Empirical polynomial of degree 47</a>

%F Empirical polynomial of degree 47 (see link above)

%e Some solutions for n=4

%e ..0..0..0..0..1....0..1..0..0..1....0..0..1..0..1....0..0..0..1..1

%e ..0..0..0..0..0....0..0..0..0..1....0..1..0..0..1....0..1..0..0..0

%e ..1..1..0..0..0....0..1..1..1..1....1..0..0..0..1....1..1..0..0..0

%e ..1..1..1..0..0....1..0..1..1..0....0..0..0..0..1....0..1..0..0..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Jul 16 2013